1. Interference Mitigation by Initial Configuration for Femtocell Access Points in IEEE802.16m Network
IEEE Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-08/605
Date Submitted:
Source:
Yuefeng Zhou, Karthik Sundaresan
Honghai Zhang, Nader Zein, Sampath Rangarajan Voice:
NEC
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IEEE Session #56, Denver, CO, USA
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Purpose:
To discuss and adopt the proposed Interference mitigation scheme for Femtocell herein for the m SDD
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2. Interference Mitigation by Initial Configuration for Femtocell Access Points in IEEE802.16m Network
Authors:
Yuefeng Zhou, Nader Zein
NEC Europe
Karthik Sundaresan Honghai Zhang, Sampath Rangarajan
NEC US Labs

3. Interference Mitigation by Initial Configuration for Femtocell Access Points in IEEE802.16m Network
Femtocell has gained tremendous momentum in the industries. It has been regarded not only a new technology to provide reliable indoor coverage, but also a new business model for higher quality and cheaper integrated services.
3G Femtocell has been deployed in Europe
LTE ( LTE-A) and WiMAX Forum are making efforts on Femtocell standardization
IEEE802.16m has to consider supporting Femtocell Access with spectrum efficiency
IEEE802.16e-based Femtocell has been considered by WiMAX Forum SPWG;
IEEE802.16m needs to consider supporting Femtocell Access with spectrum efficiency

4. Interference Mitigation by Initial Configuration for Femtocell Access Points in IEEE802.16m Network
Interference Mitigation is an important aspect for Femtocell access
Macro cell base station has high transmission power and will interfere the Femtocell, which is under the coverage of the Macro cell; Also, Closer femtocells will interfere each other as well.
Macro cell
Femtocell 2
Femtocell 1
Closer femtocells will interfere each other

5. Interference mitigation by initial configuration
Interference Mitigation by Initial Configuration for Femtocell Access Points in IEEE802.16m Network
Interference mitigation by initial configuration
Once Femtocell access point is switched on, the access point should have capability to scan the radio environment, and detect the existing cells surrounding itself.
Femtocell access point should then report following information to high layer network controller, such as ASN-GW;
List of the index of the detected preambles;
List of the signal strength of the detected preambles;
Required traffic load ( or number supported MS within the femtocell );
The index of the preamble with the least received signal strength;
The high layer network controller, such as ASN-GW, will assign preamble, subchannels for the femtocell access point to mitigate the interference and allow appropriate traffic load within the femtocell.

6. Proposed Text
-- IEEE802.16m-based Femtocell access point shall support neighbor station measurement, when it starts to enter the network. The measurement should include the signal strength and preamble index of neighbor stations/access points with unique IDs, and the index of the preamble with the least received signal strength. The femtocell access point shall report these measurements to ASN-GW to facilitate the scheduling algorithm in ASN-GW to allocate preamble and subchannels to the femtocell access point. The femtocell access point may report the maximum number of MS and maximum traffic load supported by the femtocell to ASN-GW.